Maltego is an open source intelligence (OSINT) and graphical link analysis tool for gathering and connecting information for investigative tasks.
It allows to transform data using external knowledge and visualize the results in a graph topology.
Transforms are small pieces of code that automatically fetch data from different sources and return the results as visual entities in the desktop client. Transforms are the central elements of Maltego which enable its users to unleash the full potential of the software whilst using a point-and-click logic to run analyses.
Netcap provides a set of entities and transformations to analyze packet capture dump files in Maltego!
Deep Packet Inspection
Read more about it in the documentation: Maltego Integration.